she has been working there for 4 years. This means she must be doing something right or else your aunt wouldn't be keeping her for so long.

What about you? How old are you? You are old enough to be living independently so why are you still living off your aunt? You are saying these things about the lady but what about you? I am sure she is saying the same thing about you. What I am saying is, every people have different view and you have a choice.